Features: 4 in 2 out sound source signal remote switch: supports 4 inputs and 2 outputs. Headphones speaker switching: It can achieve quick switching between headphones and speaker, convenient for users to choose to their needs. Double switching 2 in and 4 out without loss: Supports bidirectional switching function, with 2 in and 4 out design to ensure no loss during signal transmission. Remote controlled: With remote controlled function, convenient operate. Quality: ensures signal transmission quality, without loss output. Specifications: Color: Black Size: about 123x75x38mm/4.84x2.95x1.5inch Power: USB 5V power Impedance: 10KΩ - 50KΩ Frequency Response: 20-20kHz Distortion: <0.002% Input channel: 4 set stereoed switching input (can not be mixed at the same time, 4 select 1 input) Output channel: 2 set stereoed switching output (can not be simultaneously output, 2 select 1 output) Control switching mode: manual switching, remote controlled switching Input switching channel: 4ch Output switching channel: 2ch Package Includes: 1x Sound Source Signal Selection Switcher note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.